单项选择题 Your network contains an Active Directory forest. The forest contains a single domain named contoso.com. The domain contains four domain controllers. The domain controllers are configured as shown in the following table. All domain controllers are DNS servers. You plan to deploy a new domain controller named DC5 in the contoso.com domain. You need to identify which domain controller must be online to ensure that DC5 can be promoted successfully to a domain controller. Which domain controller should you identify?（）

单项选择题 Your network contains an Active Directory domain named contoso.com. The domain contains an organizational unit (OU) named OU1. You need to ensure that when new client computers join the domain, their computer accounts are created in OU1 by default. What should you do?（）

多项选择题 Your network contains an Active Directory forest named contoso.com. The forest contains a single domain. All servers run Windows Server 2012 R2. The domain contains two domain controllers named DC1 and DC2. Both domain controllers are virtual machines on a Hyper-V host. You plan to create a cloned domain controller named DC3 from an image of DC1. You need to ensure that you can clone DC1. Which two actions should you perform?（）